Flatfoot May Lead to Knee Arthritis.

DID YOU KNOW?

Having flat feet is associated with an increased prevalence of knee pain and cartilage damage in older adults according to research funded by the Arthritis Foundation. Using the Framingham Foot and OA Studies, a research team from Boston University School of Medicine and the Institute on Aging Research in Boston gathered data on 1,884  older adults whose mean age was 65 years. Twenty-two percent of knees were reported as painful on most days. Magnetic resonance images of the painful knees were acquired to determine the health of the cartilage within the joint. The Staheli Arch Index was used to determine the participants’ foot arch shape. The scientists analyzed the data and adjusted for age, sex and body mass index. 

They found that people with the lowest foot arches – commonly called “flat feet” – had 1.39 times the odds of having pain in the knee on the same leg as the low arch. Likewise, those with flat feet had 1.76 times the odds of having cartilage damage in the inner aspect of the knee joint (the medial tibiofemoral compartment). Because of the nature of the study, cause and effect cannot be determined. 

People with low or flat arches may be able to ensure proper knee alignment by wearing supportive shoes and/or orthotic inserts. 

Gross KD, et al. Planus foot morphology is associated with knee pain and cartilage damage in older adults. Abstract presented at American College of Rheumatology Annual Scientific.

Are my running shoes the right ones?

Minimalist shoes, a controversial topic in foot and ankle biomechanics and running safety.

So what is it that lets me know that a shoe like the one I wore today is the right one? I’ve tried to think about this scientifically, but sometimes subjective impressions are good enough, or even better when it comes to individual impressions. 

Here are 5 subjective things that let me know a shoe is a good match:

1. It causes no pain. 

No abrasion, no hot spots, no unusual aches in my legs or feet. No pain is good. Note: sometimes pain may be present as your body adapts to a given shoe, and it starts to feel better after a few runs, so this may not always be a perfect indicator on your first run in a shoe.

2. It disappears on my feet. 

If I weren't concentrating on how it feels, the shoe would go completely unnoticed. It doesn't make me think about my form, it doesn't force my feet to move in ways that they don’t want to, and it doesn't get in the way while I run. When I run in a shoe that’s a good match, I feel strong and as if my body is in complete control. A good shoe works with my body, not against it.

3. Ground contact simply feels “right.” 

This is something that is extremely difficult to verbalize but very easy to feel the moment I start running in a shoe that’s a good match for me - a good shoe simply feels right when it hits the ground. Unfortunately, it may require running in a lot of shoes before you get a sense of what the “right” shoe feels like for you. After you get a sense of the variation among several shoes, you begin to notice that some shoes feel dead on contact, and they feel like they rob your legs of energy. A good one feels responsive and like it’s helping you progress forward on your run.

4. It makes you want to run fast. 

Sometimes a shoe feels so good that you simply want to cut loose and run wild. It’s an incredible feeling to have everything clicking and hit that moment when you start cruising down the road or trail with reckless abandon – it’s like I imagine sitting behind the wheel of a sports car might feel (I drive a Prius…). A good shoe makes you want to move, and move fast!

5. A good shoe makes you long to run in it again. 

This, for me, is the number one sign that a shoe is a good match. When I finish a run in a good shoe, I simply can’t wait to run in it again. In fact, it may motivate me to get out the door simply so I can put it back on my feet. As I sit here writing this, I have the shoes I wore on the trails this afternoon on the floor next to me, and I have half a mind to go out for an evening run in them just to put more miles on them. On the other hand, it takes willpower to run in a shoe that just doesn't feel right to me – it’s like a wasted opportunity to get maximum enjoyment from the time I spend on the run. When you want to run in a particular shoe even though you have 50 to choose from, you know it must be a good one.